Microsoft has released Service Pack 1 for Office 2003, the update includes all prior hotfixes released:
Excel 2003 Update: KB834691
Office 2003 Critical Update: KB828041
Word 2003 Update: KB830000
The full installer weights in at 73,9MB so it's obvius that there are quite many bugfixes included. Go to their [URL=http://www.microsoft.com/downloads/details.aspx?FamilyID=9c51d3a6-7cb1-4f61-837e-5f938254fc47&DisplayLang=en]download page[/URL] and get it if you need it.